Adeveloper subdivided a 25-acre tract of land into 100 quarter-acre lots. on each lot she built a two-unit townhouse. the deeds to each of the purchasers contained a covenant that "the grantee, his heirs and assigns" would use the property only for single-family use. all deeds were promptly and properly recorded. subsequently, the zoning laws were amended to allow multifamily use within the subdivision. six months later, a social worker offered to purchase an original owner's unit that was for sale. the social worker informed the owner that she planned to operate a halfway house out of the unit, an activity in conformity with the applicable zoning regulations. therefore, the owner did not include the single-family restriction in the deed to the social worker. if a neighbor, who purchased his lot from the developer, seeks to enjoin the operation of the halfway house, will he succeed? a no, because the deed from the owner to the social worker did not refer to the covenant. b no, because the social worker relied on the zoning regulations when purchasing the unit. c yes, because the social worker had notice of the restrictive covenant. d yes, but only if the neighbor can establish a common scheme for development.